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add notes for terminal authors

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nick black 2021-10-06 18:29:58 -04:00
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@ -243,4 +243,19 @@ are best avoided until the problems are better understood:
* '۝' U+06DD ARABIC END OF AYAH
* '࣢' U+08E2 ARABIC DISPUTED END OF AYAH
* '﷽' U+FDFD ARABIC LIGATURE BISMILLAH AR-RAHMAN AR-RAHEEM
'
## Notes for terminal authors
The `notcurses-info` tool built as part of Notcurses can be used to inspect
how well your terminal supports Notcurses. It is generally desirable that:
* Your terminal draw Unicode's Line- and Box-Drawing characters itself,
rather than relying on the font.
* Your terminal support some graphics protocol, ideally Kitty's. If you
support Sixel instead, implement `XTSMGRAPHICS`.
* Implement a keyboard disambiguation protocol, ideally Kitty's.
* Implement `hpa`, for absolute horizontal positioning.
* Size EGCs according to the largest `wcwidth()` result returned for any
of the component characters.
* Honor Unicode rules for segmentation, including Zero-Width Joiners. Emit
either zero or one glyph per EGC.